I think that one is 8 or 10m high. It's very wide open country, so seems to work fine. I also use the tower with a rope pulley at the top to pull up the pump when it needs leathers. The pump is only down 4m / 12' or so, so it's an easy job.
Adriaan is right saying that the towers also had to straddle a large diameter well in lots of cases. That one is a 30" casing.
I actually put this mill up when I was a teenager. The old well caved in, so we had a new one bored about 20' away, and moved the windmill over. While the mill was down, i went through it and painted the cast parts. That's why it still has red paint. That was probably close to 20 years ago now.
Yes, that is a big earthmover tire. They are free and should last 100 years or so. Cows aren't exactly gentle creatures when they all get to the trough at the same time. It takes a beating. It's a difficult job to cut out the sidewall. A reciprocating saw and lots of soapy cooling water. The other sidewall stays, and the rim hole gets filled with concrete. I think it holds about 2500L Maybe 3000L of water.
I guess i should also mention the solar panels. 2x 240w i think. They run a solar submersible pump. The solar pump only runs when it is sunny. No batteries. Between that and the windmill, there is always water.